Greenhouse Single Layer Poly vs Double Layer Temperature Comparison

Not even close. Double polyethylene is insulated and holds heat much better. A single layer greenhouse will increase you grow season, but isn’t efficient to heat. In my opinion both have a place for growing. A lot depends on your growing zone or what you’re growing for your needs. This single Layer Greenhouse is $1,300 and if it was double poly it would cost about $300-500 more depending on labor costs. My fully insulated greenhouse is about $3,000-$3,500 in materials, but it’s a post frame lean to. You can go. Cheap and use zipper doors. It’s really whatever your budget allows.